Our results show that the two-body db-MBE( ) is able to provide highly accurate relative and total interaction energies for all test cases considered here. The remaining errors are comparable to those found earlier for neat water clusters . Thus, the density-based many-body expansion is able to capture the large polarization effects in these systems already at the level of a two-body expansion. With the conventional eb-MBE, a threebody or even a four-body expansion is required to achieve a similar accuracy.