  The issue of surface sensitivity, and its relationship with interpretation of
spectral features observed in angle-resolved photoemission spectroscopy
experiments is investigated. Rather than attempt to make an explicit connection
to bulk electronic structure calculations, we take the new approach of
exploring this issue within the natural context of a vacuum-terminated
crystalline slab. Doing so, we reconcile the empirical reality of reliable kz
fidelity with acute surface sensitivity of this technique. In addition, we
identify several critical issues which impact the estimation of kF , band
velocity, and self-energy from photoemission experiments.
