A composite wall consists of a 1 mm-thick stainless steel plate (AISI 316), 2 cm of plywood, and 2 cm of low-density particle board. The stainless steel surface is maintained at 380 K while the other side loses heat to ambient air at 300 K, with convection heat transfer coecient of 5 W/m2K. Estimate the heat flow per unit of area.