2.42 At 20 GHz, the permittivity of ocean water at

20 °C is water = (36-j30) and the permittivity of

crude oil is oil = (2.1-j0.1). The oil layer is of

thickness d and overlays the water surface. Compute and

plot the magnitude of the normal-incidence reflection

coefficient as a function of d from 0 to 30 mm in 0.1 mm

increments.