The increased use of composite materials and adhesively bonded joints has resulted in the need for the development of inspection techniques appropriate for multi-layered structures. Normal incidence ultrasonic pulse-echo imaging has been and continues to be a principal technique for the detection of interface condition. Ideally, only a single reflection from each interface in the layered structure would be received and the ultrasonic image would be based upon a single parameter intrinsic to the material, such as the reflection coefficient. The reflection coefficient is, in turn, primarily determined by the relative change in ultrasonic impedance across the interface. In the absence of a complete inversion procedure by which the reflection coefficient may be calculated from pulse echo-data, the reflected signal amplitude is used to form the ultrasonic image. Unfortunately, the reflection amplitude, as indicated in Figure 1(a), often decreases rapidly due to the presence of reflective, overlying interfaces.