Having demonstrated that B97-3c gives good results for both absolute binding energies and relative energy ordering, and that the refinement approach of CREST followed by B97-3c mostly reproduces the results of previous work on the pyrene homodimer with significant time savings, the process was applied to homodimers of additional small polycyclic aromatic molecules, with and without heteroatoms. The eight monomers, along with pyrene, are shown in Figure .