(a) Zigzag Ti chain and n-biphenyl structural unit in TiC₃ monolayer and its ELF maps.^[152] (b) Cohesive energies of predicted Ti_1−xSi_x monolayers and three stable structures under different composition.^[97] (c) Formation enthalpy versus concentration (y) for Ge_xP_y and stable structures.^[76] Reprinted with permission from Ref. [152], Copyright 2018 American Chemical Society. Ref. [97], Copyright 2016 American Chemical Society. Ref. [76], Copyright 2018 American Chemical Society.