1. The transformer winding contains a 4-layer primary winding, and two 2-layer secondary windings. Each layer of the primary winding carries total current I. Each layer of secondary wind#1 carries total current 1.5I. Each layer of secondary wind#2 carries total current 0.5I. All current are sinusoidal. The effective relative conductor thickness is . The winding are partially interleaved, in the following order: two primary winding layers, followed by both layers of secondary#1, followed by both layers of secondary#2, and finally the two remaining primary layers.