Figure , e and f are p-type materials selected from the top left, bottom left and bottom right of Figure , respectively. Figure shows the compound KRb2YF6, which, like K4Ta2S11 has a high density of bonds and interspersed oppositely charged anions that explain the high exfoliation energy. Figure shows the compound TlF3, which does appear to be possible to separate into constituent layers. Like BCl3, TlF3 has potential interactions between the cations and anions, visible as long bonds in the centre of the unit cell in this case. We believe this explains how the material (like BCl3) exhibits both a relatively isotropic effective mass tensor and a relatively low exfoliation energy. Finally, we again end with a material that has both a high standard deviation of effective mass and a low exfoliation energy in TiBrN. Again, like ScBrO, we believe this material is highly likely to be an inherent 2D material as it has a bonded layer structure, and these bonded layers are terminated in anions as in the case of the archetypal 2D materials. Please do not adjust margins Please do not adjust margins These two sets of sample materials, whose information is summarized in Table , lends confidence to our initial premise, that the conductivity effective mass tensor can provide a summary of chemical structure and the likeliness of manifesting a layered nature. Based on our results it seems that n-type and p-type conductivity effective mass sampling perform equally well in estimating 2D nature. Furthermore, we remind the reader that our slabs were constructed without human intervention. We believe these results also corroborate our simplistic automated exfoliation approach.