We have carried out surface x‐ray scattering measurements to determine the phase behavior of molecular systems in contact with solid walls and at the vapor interface. For molecular systems the interfacial interactions often give rise to surface freezing, where a single or double frozen layer informs at the interface over a range of temperature where the contacting bulk is molten. Our recent results at oxide surfaces show that the surface frozen temperature depends on the specific interactions with the interface. Recent results from the BNL Soft Matter Group and its collaborators will be presented.