Fibrous materials frequently appear, at the macroscopic scale, as thin layers (or "plates"); for instance, as polycrystal-like, porous networks of nanofibers or as composite-like, epoxy resin matrices reinforced by fibres. Such materials are typically lightweight, strong, and often also renewable as well as biodegradable; attributes that offer them considerable versatility and therefore utility in engineering applications. Accordingly, innovative products incorporating such materials and/ or related structures (such as "paper-based" transistors) have been emerging and reshaping our technological landscape. Yet, research and development unleashing such products is still very much experiment-, trial-and-error-based; so that, our understanding of the multiscale organization, as well as the mechanical and physical behaviour of their constituting materials and/ or structures remains poor. Consequently, the innovation process is quite chaotic, and the potential to generate yet unforeseen product applications largely untapped. In addition, considerable uncertainty surrounds the long-term performance of such innovative products throughout their entire life cycle. This is true even for century-old products such as "paper", for which there is still huge room for improvement in terms of controlled production and use [1, 2]. This symposium aims at bringing together scientists and engineers involved in cutting-edge theoretical, computational, and experimental research on multiscale organization, mechanics, and physics of fibrous, thin-layer materials and related structures. Submitted contributions should address recent advances in the following areas: 1) Multiscale, experimental determinations on hierarchical organization (at both continuum and atomistic/ sub-atomistic scales); 2) Multiscale, experimental determinations on mechanical, physical, and coupled physical responses; 3) Theoretical developments and their computational implementation (at both continuum and atomistic/ sub-atomistic scales); 4) Comparison of multiscale, theoretical predictions with respective, experimental determinations. REFERENCES [1] P.M. Godinho, S. Scheiner and C. Hellmich, Realistic Multi-Step Micromechanics Model for Paper Sheets considering Fiber Collapse Degree, International Journal of Engineering Science (Submission imminent). [2] P.M. Godinho, Multiscale, Continuum Micromechanics of Paper: Elasticity and Strength, Doctoral thesis, Vienna University of Technology (Submission imminent).