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Design and fabrication of the 2.5D metamaterials: (a) the structural unit was printed on a single layer of paper and stacked together, (b–e) schematic of the 2.5D design: (b) top view, (c) oblique view, (d) 2D cross-sectional view of the structure, and (e) 3D illustration of the simulated metamaterials . Reproduced with permission from X. Fu et al., Adv. Eng. Mater. 22, 1901126 (2020). Copyright 2020 Wiley. (This figure is subject to copyright protection and is not covered by a Creative Commons Commons license.)
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