Subject: Do the Slater rules for determining screening constants take into account

Do the Slater rules for screening constants take into account the stability of 
filled and half filled orbitals?  What other things did Clementi&Raimondi take 
into account when they calculated their values for effective nuclear charge?  I 
know that Slater and Clementi&Raimondi came up with close results, but they 
both calculated different results.  I know that certain elements (Cr for 
example) prefer an unexpected electronic configuration due to the exchange 
energies that "override" the spin-spin energies.  However, how does the special 
stability of half-filled orbitals relate to the effective nuclear charge, and 
is it ever considered when calculating Zeffective?

Re: Do the Slater rules for determining screening constants take into account