Spin-scaled variants generally yield larger MADs in D e than their unscaled counterparts, except where the unscaled variant has a tendency to overestimate excimer binding: SCS-RSX-QIDH, and SCS-/SOS-ωPBEPP86. MADs in D e range from 1.83 (SCS-ωPBEPP86) to 13.70 (SOS-B2PLYP) kcal/mol, occupying both the smallest and largest MADs of the kcal/mol. The similarity of SCS-and SOS-B2GP-PLYP is unsurprising given their spin-scaling parameters differ the least of all functionals tested. Correspondingly, SCS and SOS variants of RSX-QIDH have the greatest difference in their spin-scaling parameters, and see the largest variation in MADs of the spin-scaled functionals tested. For r e , spin-scaled functionals also give larger errors than unscaled functionals, except for spin-scaled variants of both ωPBEPP86 and ωB88PP86. SOS variants also give generally larger r e MADs than SCS with the exception of RSX-QIDH and ωPBEPP86. In contrast to the larger errors of unscaled ωPBEPP86, both spin-scaled variants of ωPBEPP86 give the smallest MADs in both D e and some of the smallest in r e . As discussed in Section 4.1.2, the benefit of spin scaling for this functional may favourably reduce the overestimation of binding energies caused by its large perturbative component. This may support that the spin scaling better balances the electron correlation effects overestimated by second-order perturbation theory. Interestingly, the low errors of SCS-and SOS-ωPBEPP86 contrast its documented difficulty in (accurately) describing intermolecular CT.