The conditions under which a film-substrate system preserves the state of linear polarization of light of arbitrary azimuth that is obliquely reflected from such a system provide the basis for the design of film-substrate single-reflection linear partial polarizers (LPP), which also operate as reflection optical rotators. The important characteristics of a comprehensive set of discrete designs of SiO//2-Si LPP's at lambda equals 6328 A are shown graphically.