Equation \ref{m0162_eetaeq} is the wave impedance in the region to the right of the boundary in the equivalent scenario shown in Figure \(\PageIndex{2}\). “Equivalent” in this case means that the inci...Equation \ref{m0162_eetaeq} is the wave impedance in the region to the right of the boundary in the equivalent scenario shown in Figure \(\PageIndex{2}\). “Equivalent” in this case means that the incident and reflected fields in Region 1 are identical to those in the original (slab) problem.
