Gconsider two copper wires separated only by their surface oxide layer (cuo). classically, since the oxide layer is an insulator, no current should be possible through the two copper wires. suppose that for the conduction ("free") electrons in copper, the surface oxide layer looks like a square potential barrier of height 10 ev. consider an oxide layer thickness of 5 nm and evaluate the transmission coefficient for conduction electrons in copper, which have a kinetic energy of about 7 ev. what will be the transmission coefficient if the oxide barrier is 1 nm?