Destruction of superconductivity in quench-condensed 2D films

We have performed systematic tunneling measurements on two dimensional quench-condensed films of Sn and Pb to investigate the destruction of superconductivity by localization effects. 

With increasing sheet resistance of the films, the energy gaps and tau(c)'s decrease only slightly, but the gap edges broaden until the width becomes comparable to the gap. Associated with this broadening are low temperature finite resistance tails in the resistive transitions.