It should also be noted that theoretical tools for the calculation of charge mobilities are continuously improving in both accuracy and efficiency. Density functional perturbation theory combined with Wannier interpolation can yield highly accurate predictions of electron mobility and conductivity in semiconductors and does not rely on the constant relaxation time approximation for example, unlike the BoltzTrap method. New open-source tools have also been released recently lending such advanced techniques to highthroughput screening, which could provide an even better basis for large-scale analysis projects such as this in the future. Finally, we highlight that according to our data WS2 -one of the archetypal 2-dimensional materials -has very small standard deviation of conductivity effective mass for both p-type and n-type sampling and has a small exfoliation energy (see Table ) and does have anion terminated bonded layers in its crystal structure. The atomic structures of the four archetypal 2D materials are shown in Figure . This places one of the most important 2D materials outside of the premise of our paper. Together with the several outliers that can be seen in Figure , we conclude that while the conductivity effective mass tensor can be instructive in the field, 1 the relationship between it and exfoliation energy is not absolute in applicability. On the other hand, we do find that the conductivity effective mass tensor is very useful in predicting the crystallographic direction along which a material can be exfoliated. The code used in this work was designed according to this principle.