2.42 At 20 GHz, the permittivity of ocean water at 20 C is water = (36 j30) and the permittivity of crude oil is

2.42 At 20 GHz, the permittivity of ocean water at 20 ◦C is εwater = (36 − j30) and the permittivity of crude oil is εoil = (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.