  A recent letter [Lin & Goldman, Phys. Rev. Lett. 106, 127003 (2011)] has
presented experimental data in highly disordered thin films, which were
interpreted as a quantum phase transition, an intriguing and surprising result
for this system. Here we present a first-principles calculation which captures
the observed phenomena, and provides an alternative mechanism of activated
transport through the disordered landscape rather than a quantum phase
transition.
