This procedure, which has also been called HF-DFT, has been shown to correct some of the worst delocalization problems associated with GGA functionals, including those with reaction barrier heights, torsional barriers, halogen bonding, 61 potential energy surfaces for main-group radicals, and polaron defects in metal oxide materials. In the present work, we investigate the ability of DC-DFT to correct conformation energies of the π-delocalized systems in Fig. , and examine how that impacts the predicted stabilities of the corresponding polymorphs.