Figures and shows representative examples of the types of structures that are predicted to be of the lowest energies. Single layers or completely intercalated (HCN surrounded) ethane are preferred ahead of adjacent slabs of ethane and HCN. At the same time, the lowest energy structures all fall in a range of 0.5 to 1.0 kJ/mol above pure HCN and ethane (Fig. ), which seem to suggest that cocrystal formation is not spontaneous. However, these energies are exceedingly small, overlapping with the available thermal energy on Titan's surface (kBT ≈ 0.8 kJ/mol), and are within the inherent accuracy of the computational methodology we use. Furthermore, these estimates lack two key components: entropy of conformation and mixing.