Complexes with large D/E ratio (1.3 < D/E < 5.42) are categorized as dispersion complexes. These complexes include stacked dimers. Indeed Fig. (b) shows relatively large QDO correction compared to DF interaction energies. It is evident that PBE functionals, by themselves do not predict any binding for these complexes. As expected for such cases, QDO correction is the most significant source of binding energies. In fact, for most of the complexes QDO contribution is very prominent.