Upon introducing a single adatom defect, the planarity advantage of [6]C is lost. [6]C bows slightly over the adatom, but the adatom's presence leads to significantly diminished dispersive interactions between the adsorbate and the metallic surface, as shown in Table and shows much weaker restructuring of the adsorbate density of states in the one-adatom surface than in the pristine surface case, consistent with weaker binding. enantiomers displayed similar binding energies regardless of the number of adatoms and the defect pattern. Furthermore, a compelling feature of the deposition process for these molecules is polymorphism. Multiple configurations with similar energies were found for both enantiomers.