For the benzene excimer, excited-state interaction energies calculated across varied inter-monomer distances at the SCS-CC2/CBS (3,4) level of theory (Fig. ) yield a dissociation energy of 13.65 kcal/mol at 2.97 Å (r e ). The ability to describe the shape and depth of the potential energy well differs from DFA to DFA. The assessed global hybrids (left panel in Fig. ) consistently underbind the benzene excimer, underestimating D e by 2.97-7.96 kcal/mol (22-58% error) and overestimating r e by 0.16-0.20 Å (5-7% error), corresponding to the largest errors for this system.