From our discussions so far we observe that can be written as

 .................(6.67)

The quantity S is called as the standing wave ratio.
As the range of S is given by

From (6.62), we can write the expression for the magnetic field in medium 1 as

.................(6.68)

From (6.68) we find that will be maximum at locations where is minimum and vice versa.
In medium 2, the transmitted wave propagates in the + z direction.