Interpretations of IR and millimeter wave measurements in superconductors are generally carried out in terms of the Mattis-Bardeen calculations, which apply either to the anomalous skin effect regime or to the dirty limit regime. In high temperature superconductors neither limit applies. Reflectance measurements on high quality, epitaxially-grown, laser-deposited films indicate that these samples are in the clean-limit, normal skin effect regime. Features that have been previously identified as the gap appear in both the superconducting and the normal-state spectra, although obscured by the free carrier absorption above Tc. Below Tc these features become more evident as the free carrier contribution condenses into a delta function at zero frequency.