The selective reflection profile of a cholesteric liquid crystal is asymmetric when (a) for light incident parallel to the cholesteric helix axis, the incident polarization vector,E, is at an angle other than 45° to the molecular director at the first surface or (b) for light incident oblique to the cholesteric helix axis, the incident polarization is S- or P-polarized. We confirm these effects using cyclic polysiloxanes. Further, we show that the use of a new form of cholesteric liquid crystal called flakes allows the first experimental separation of the asymmetry due to the surface and that due to the bulk.