Req CCSD(T) Req SAPT not negligible, this indicates that even for relatively simple molecules in different geometrical configurations, the equilibrium distance can vary significantly depending on the nature of the underlying interaction. Additionally, in a parallel configuration, all four atoms are directly involved in the intermolecular interaction, increasing the exchange repulsion at short distances, which can only be compensated at longer distances with the slower decaying dispersion terms. Interestingly, in a colinear configuration, there is a cancellation of forces between electrostatic and induction terms, favoring the dispersion and exchange balance, and leading to an effective vdW radius of 2.89 Bohr, and an estimated free vdW radius of 3.13 Bohr.