Extensive ab initio calculations are performed on BEDT-TTF dimeric uni
ts singled out from the kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Br (ETBR) struc
ture. From a careful analysis of the results obtained for dimers with
total charge ranging from 0 to 4 we are able to get reliable estimates
of the Hubbard model parameters.