Multi-layered structures containing GaN on SOD substrates are described. The cup product has a cup for covering a breast, a scallop portion provided at a peripheral edge of the cup, and an ornamental lace portion provided over a surface of the cup. The electronics module combines the detection signals from the acoustic sensors to obtain a combined signal that substantially excludes signals propagating in a direction opposite to the communication signal. These third and fourth layers do not extend the full length of the blade to provide supplemental stiffness while avoiding excess bending stress. The invention also relates to an appropriate method.