An analysis [Phys. Rev.B 44, 3277 (1991)] linking surface resistivity,
surface reflectance, adsorbate vibrational damping, and infrared anti
absorption resonances to the scattering of electrons by adsorbates ove
rlooks a crucial distinction between elastic and inelastic scattering.
When the proper distinction is made, the relation between resistivity
and reflectance is preserved, but the connection to damping and antia
bsorption resonances must be significantly modified.