Two-dimensional (2D) crystals are the blazing lights on the horizon of materials research due to their unique characteristics and intriguing applications . The stability and physical and chemical properties of these materials mainly depend on the lattice structure and atomic arrangement. For instance, the puckered, buckled, and planar arsenene show significantly different stability factors and electronic behavior from each other . In addition, the planar indiene shows a metallic behavior contrasting with the semiconducting nature of buckled indiene .