Ambient pressure and size-tunable layered polynitride structures constructed from fourfold coordinated C2N8 cagesRemoveDong-Xue Wang (王冬雪), Shuang Liu (刘爽), Zhen Yao (姚震), and Bing-Bing Liu (刘冰冰)Phys. Rev. B 112, 094114 (2025)