). Functionals that employ range separation of this sort are generally known as range-separated hybrids, but only those that use 100% exact exchange at long range are designated as LRC functionals. Of the standard GGAs, meta-GGAs, and hybrid functionals in common use, only LRC functionals afford υ xc (r) ∼ -1/r. For XSAPT calculations, we typically use the LRC-ωPBE functional. 103 That choice alone does not guarantee that the IE condition in Eq. ( ) is satisfied, and adjusting the range-separation parameter (ω) in order to satisfy that condition has been suggested as a nonempirical means to obtain a functional with correct asymptotics. Alternatively, a global density-dependent (GDD) tuning procedure can be used, in which the length scale for range separation (1/ω) is set by considering the distance between the outmost electron in a molecule and the region of localized orbitals. The value of ω that is determined in this way is often a good approximation to that obtained via "IE tuning", to satisfy Eq. ( ), yet the GDD procedure is automatable and sidesteps certain issues with IE tuning in extended systems. The GDD procedure is especially convenient for SAPT(KS) calculations because ω must be tuned individually for each monomer. The monomer-centric nature of SAPT means that tuned LRC-DFT maintains size consistency, which is generally violated by the "optimal" or IE-tuning procedure, 107 because dimer DFT calculations are not required. In contrast, the use of monomer-specific tuning in inconsistent in the context of any DFT-based EDA that requires both monomer and supramolecular calculations.