  We consider iron impurities in the noble metals gold and silver and compare
experimental data for the resistivity and decoherence rate to numerical
renormalization group results. By exploiting non-Abelian symmetries we show
improved numerical data for both quantities as compared to previous
calculations [Costi et al., Phys. Rev. Lett. 102, 056802 (2009)], using the
discarded weight as criterion to reliably judge the quality of convergence of
the numerical data. In addition we also carry out finite-temperature
calculations for the magnetoresistivity of fully screened Kondo models with S =
1/2, 1 and 3/2, and compare the results with available measurements for iron in
silver, finding excellent agreement between theory and experiment for the
spin-3/2 three-channel Kondo model. This lends additional support to the
conclusion of Costi et al. that the latter model provides a good effective
description of the Kondo physics of iron impurities in gold and silver.
