PAR provides azimuth and elevation for a precision talk down. Also the old Type 82 radar as used at eastern radar and others had something known as stacked beams from which you were able to use and compare elevation(altitude) and provide separation of aircraft based on this information from your height finder. ie the target aircraft did not have to have SSR for the ATCO to provide a vertical separation provided both your aircraft and the unknown were able to provide a valid height from the radar system and they were different by at least 5000ft!! I believe this was because the radar was originally designed as a tracking radar for the bloodhound air ground missile.