Generally, functionals that predict larger D e have smaller dispersion contributions from the DFT-D type correction. However dispersion corrections for range-separated double hybrids are distinctly smaller and somewhat negligible compared to global double hybrids. For example, at the reference well-position (2.97 Å), PBE-QIDH-D3(BJ) receives a dispersion correction ten times larger than RSX-QIDH-D3(BJ) in [Figure and. Considering the relationship between spin scaling and D e (Section 4.1.1), the relative amount of dispersion correction predicted for a functional follows a general trend of unscaled < SCS < SOS, (except SCS-RSX-QIDH) which can be observed for PBE-QIDH-based functionals in Figure . This trend and the behaviour of SCS-RSX-QIDH is consistent with a coupling of the (indirect) same-spin MP2 and dispersion coefficients observed in the parameter-optimisation of DSD functionals. Same-spin MP2-type perturbative correlation and dispersion compensate for each other as they both describe long-range effects such that larger same-spin components are coupled with smaller dispersion contributions, and vice versa. For the benzene excimer, D3(BJ)-corrected global double hybrids yield absolute deviations in D e ranging from 0.03 to 3.22 kcal/mol and in r e from 0 to 0.04 kcal/mol. The addition of dispersion corrections to unscaled global double hybrids leads to overbinding errors larger than the (underbinding) errors of the dispersion-uncorrected global double hybrids. For example, absolute deviations in D e increase from 0.32 to 2.35 kcal/mol between PBE-QIDH and PBE-QIDH-D3(BJ). In comparison, overbinding is less pronounced for dispersion-corrected spinscaled global double hybrids, e.g. SOS-B2GP-PLYP-D3(BJ) only underbinds by 0.03 kcal/mol (0.2% error), Figure . Dispersion corrections also favourably reduce the r e overestimation seen for (unscaled and spin-scaled) global double hybrids resulting in errors (<1.3%) smaller than dispersion-corrected range-separated double hybrids.