An 3 compound thin film (cubic with =4Å ) was depositedon a ( 001 )-oriented substrate (body-centered tetragonal with =4Å,c=5.6Å, with the out-of-plane orientation of (001)_(Sub )//(001)_(Film). This compound has an order-disorder transition like 3. At T<100°,A atoms are located on the corners of the unit cell andB occupy the face-center positions. Above 100°, all positions arerandomly occupied by A and atoms. We are carrying out theta-2thetascan for this sample in the scan range of 2theta=30°-120° with anX-ray beam at =1.54Å.When the scan is performed at room temperature, identify all the observed peaks with their position