A simple procedure for obtaining a background-free backscattering spec
trum of a light-mass film on a heavy-mass substrate by a normal incide
nce/grazing exit geometry has been described. Using this method such f
ilms can be aligned rapidly and accurately, and the impurity or defect
information on the films can be obtained without need for realignment
. Example is given from MeV Li-3+ analysis of a deposited film of Si o
n a single crystal substrate of yttria-stabilized, cubic zirconia.