  The (111) surface of Cu, Ag and Au is characterized by a band of surface
Shockley states, with constant density of states beginning slightly below the
Fermi energy. These states as well as bulk states hybridize with magnetic
impurities which can be placed above the surface. We calculate the
characteristic low-temperature energy scale, the Kondo temperature $T_K$ of the
impurity Anderson model, as the bottom of the conduction band $D_s$ crosses the
Fermi energy $\epsilon_F$. We find simple power laws $T_K \simeq
|D_s-\epsilon_F|^{\eta}$, where $\eta$ depends on the sign of $D_s-\epsilon_F$,
the ratio between surface and bulk hybridizations with the impurity
$\Delta_s/\Delta_b$ and the ratio between on-site and Coulomb energy $E_d/U$ in
the model.
