  Core-polarization interactions are investigated in low-energy electron
elastic scattering from the atoms In,Sn,Eu,Au and At through the calculation of
their electron affinities. The complex angular momentum method wherein is
embedded the vital electron-electron correlations is used. The
core-polarization effects are studied through the well investigated rational
function approximation of the Thomas-Fermi potential,which can be analytically
continued into the complex plane. The EAs are extracted from the large
resonance peaks in the calculated low-energy electron atom scattering total
cross sections and compared with those from measurements and sophisticated
theoretical methods. It is concluded that when the electron-electron
correlation effects and core polarization interactions are accounted for
adequately the importance of relativity on the calculation of the electron
affinities of atoms can be assessed. For At, relativistic effects are estimated
to contribute a maximum of about 3.6 percent to its (non-relativistic)
calculated electron affinity.
