Firstly, we identify the materials from the Materials Project that present with an energy above convex hull of 0 eV. These materials IDs are then cross-referenced with the publicly available database of calculated conductivity effective mass values of Ricci et al. While the known examples of 2D materials have band contraction in the conduction band (see Figure ), it may not necessarily be the case for all 2D materials. As a result, we consider datasets for both p-and n-type effective mass in parallel.