Today I studied Slater's rules for calculating the effective nuclear charge. One particular line, "The shielding power of the d and f orbital is lesser in comparison to the p and s orbitals", seems to appear in every single book and website I have studied from.
Slater's rules does not seem to take into account the orbitals for calculation of $Z_\mathrm{effective}$. Nevertheless, I don't disagree with the logic behind the statement.
Thus my question is: Do Slater's rules actually account for this logic? If they don't, is it faulty? And, how do Slater's rules account for the shielding effect of the individual orbitals?