High-resolution SEM images enable measurements of the dimensions of yarns. (A) Mosaic of high-magnification SEM images showing a variety of yarns bridging adjacent platelets. (B) Distribution of measured yarn length. Average yarn length, 0.77 ± 0.44 μm (N = 191). (C) Distribution of measured yarn diameter. Average yarn diameter, 0.40 ± 0.15 μm (N = 191). Length and diameter were measured using ImageJ on SEM images.