Hydrogen and deuterium profiles can be measured using various polymer blends by using this technique. Green and Russel have studied the segregation of deuterated polystyrene/polymethamethacrylate copolymer at the interface of polystyrene, and polymethylmethacrylate homopolymer at the interface of polystyrene and polymethylmetacrylate homopolymer using ERDA with 2.8 MeV 4He+ ions. They also studied the interface properties of copolymers/Al or Si structures. Figure 19 shows the results obtained which is a typical ERD spectrum of yield vs. energy of P(d-S-b-d-MMA) block copolymer chains that segregated at the interface of the PS and PMMA homopolymers.