As a whole, we believe there is a clear relationship between the two properties considered in this work. However, there are multiple outliers in the data which we investigate further. From the datasets represented in Figure For the n-type materials, Figure (from the top left section of Figure ) is K4Ta2S11 which presents an atomic structure that immediately appears not amenable to exfoliation. The anions and cations are reasonably interspersed throughout the structure and there is a high density of bonds present. This is to be expected given the compound's position high on the graph, as pulling apart oppositely charged ions and breaking bonds is certain to lead to a high exfoliation energy. It is also in line with the premise of the paper; since the material is to the left of the graph it has a relatively isotropic charge effective mass tensor yielding one of the lowest standard deviations of effective mass. Figure shows the material BCl3 that immediately seems quite amenable to exfoliation and unsurprisingly presents in the lower quadrant of the graph for exfoliation energy. Interestingly this material was extracted as being relatively isotropic in effective mass tensor. We believe that perhaps this can be explained by an interaction between cations and anions in the interlayer direction. It can be seen that the oppositely charged ions almost eclipse one another when viewed along the c axis, and so are likely to have electrostatic interactions that can give rise to some degree of dispersion of the electronic bands. Finally, Figure shows ScBrO a material that has both a low exfoliation energy and high standard deviation of effective mass. When contrasted with BCl3, it can be seen that this material does not have potential anion-cation interactions between the layers, instead the structure is composed of anion terminated bonded layers, similar to MoS2, MoSe2, WS2 and WSe2 and we predict to be ScBrO to be an unequivocal two-dimensional material. To the knowledge of the authors, this is the first time this compound has been highlighted as a two-dimensional material.