Two-dimensional polyaniline crystal with metallic out-of-plane conductivity - Tao Zhang; Shu Chen; Petko St. Petkov; Peng Zhang; Haoyuan Qi; Nguyen Ngan Nguyen; Wenjie Zhang; Jiho Yoon; Peining Li; Thomas Brumme; Alexey Alfonsov; Zhongquan Liao; et al. (Nature, 2025)