Conversion between the conductive 1T phase and semiconducting 2H in materials with this property has limited their application as thermoelectric materials. One class of materials with this property called TMDCs (15[1])exhibits band gap widening due to confinement effects, allowing them to be used to create flexible transistors. Materials with this property are often combined to create van der Waals heterostructures. Electronic phenomena in pairs of materials with this property are studied in (*) twistronics, like when (-5[1])a magic angle of 1.1 degrees between two materials (10[1])with this property induces superconductivity. The most famous material with this property was first created via mechanical exfoliation, which isolated the material by successively applying and removing scotch tape. For 10 points, name this property exhibited by very thin materials like graphene. ■END■ (10[1])