Table 2:

Engineered materials with designed fractality.

Material	Technique	Image	Reference
Silk fibroin	Charge-controlled self-assembly	5A	Zheng, Kaplan et al. [188]
Partially ordered peptides	Mixed ordered and disordered regions	5B	Roberts, Chilkoti et al. [189]
Collagen scar tissue model	Heterogeneous embedding	5C	Dingal, Discher et al. [92]
Flexible electronics	Horseshoe design, Kirigami	5D 5E	Fan, Rogers et al. [190]; Cho, Srolovitz et al. [191]
Electrodes	Micropatterning/lithography	5F 5G	Watterson, Taylor et al. [192]; Sage, Kelley et al. [193]