Initial ensembles of the homodimers were generated with CREST and refined using B97-3c. B97-3c refinements for both gas phase and solution phase ensembles started from the gas phase CREST output. After B97-3c geometry optimization, about half of the CREST geometries became indistinguishable from other geometries, and were removed from the ensembles. Further ωB97X-D4/def2-SVP optimization on the reduced ensembles eliminated a few more conformers, but overall B97-3c produced few false minima. Final ensembles for each dimer are reported as xyz structures in the SI.