It is known that the benzene dimer has two stable structures, T-shaped ($\ce{C_{2v}}$) or parallel-displaced ($\ce{C_{2h}}$) structure.
Now the question is: does the dissociation energy ($\ce{D_0}$) $$\ce{(C_6H_6)_2 -> C_6H_6 + C_6H_6}$$ depends on the structures? Or it is independent of the structures?