Our results can also be extrapolated to other families of materials with covalent ppσ-bonds and LEPs, such as binary IV-VI and V2-VI3 families and related ternary compounds that are, in turn, related to PCMs. Moreover, we propose that EDMBs could also be found in compounds with ptype covalent bonds in which cations show the presence of LEPs (typical of elements at their smallest valence state), such as Cl 5+ , Br 5+ , I 5+ , S 4+ , Se 4+ , Te 4+ , As 3+ , Sb 3+ , Bi 3+ , Ge 2+ , Sn 2+ , Pb 2+ , Ga + , In + , and Tl + . The EDMB formation in these compounds at different pressures will depend on the strength of the LEP stereoactivity at a given electronic density. EDMBs will be formed at RP when LEP stereoactivity is negligible, but they will not be formed when LEP stereoactivity is strong. This consideration agrees with the results of Waghmare et al. and is also consistent with the decrease of LEP stereoactivity for a given cation, e.g., Sn 2+ , Sb 3+ , when linked to chalcogen atoms in the series S-Se-Te . This explains why PCMs at RP are observed mainly in Te-based compounds, e.g., in SnTe and Sb2Te3 at RP, and not in SnS, SnSe, Sb2S3, and Sb2Se3 at RP. In these last compounds, EDMBs will be formed at HP, as already proved for GeSe, which is isostructural to SnS and SnSe . It is also well known that cation LEP stereoactivity decreases along a group, e.g. along the series Ge-Sn-Pb or As-Sb-Bi. Therefore, EDMBs are only encountred, for instance, in Se-based compounds PbSe and Bi2Se3 at RP and not in GeSe, SnSe, As2Se3, and Sb2Se3 at RP; however, EDMBs will be formed in these last compounds at HP, as already proved for GeSe and As2S3 (isostructural to As2Se3) .