30R = 0.5285 for the 1/40 interface; R = 0.02944 for the 40/80 interface; and R = 0.6382 for the 1/80 interface, all based
on the formula R = 
2
2 using the pair of permittivity values at each interface.
30R = 0.5285 for the 1/40 interface; R = 0.02944 for the 40/80 interface; and R = 0.6382 for the 1/80 interface, all based
on the formula R = 2
2 using the pair of permittivity values at each interface.