Equation ??? is the wave impedance in the region to the right of the boundary in the equivalent scenario shown in Figure \PageIndex2. “Equivalent” in this case means that the inci...Equation ??? is the wave impedance in the region to the right of the boundary in the equivalent scenario shown in Figure \PageIndex2. “Equivalent” in this case means that the incident and reflected fields in Region 1 are identical to those in the original (slab) problem.