Algorithm 1: Recursive processes for amplitude reflection coefficients.
Input:	$\lambda$
	Structure parameters: ${\theta }_1,$$n=\left\{n_1,n_2,\cdots ,n_l\right\},$$d=\left\{d_2,d_3,\cdots ,d_l\right\}.$
Step 1:	Calculate ${\theta }_k,$${\beta }_k,$ and $N_k$ using structure parameters.
	${\theta }_k={\sin }^{-}\left(\frac{n_{k-1}}{n_k}\sin {\theta }_{k-1}\right),$ for k = 2, 3, ..., l. ${\beta }_k=2\pi \cos \left({\theta }_k\right)n_k{d}_k/\lambda ,$ for k = 2, 3, ..., l. $N_k=\left\{\begin{array}{cc}{n}_k/\cos {\theta }_k& \begin{array}{cc}for& TE\end{array}\\ n_k\cos {\theta }_k& \begin{array}{cc}for& TM\end{array}\end{array}\right.,$ for k = 2, 3, ..., l.
Step 2:	Obtain ${\eta }_2$ by setting ${\eta }_l=N_l.$
	For k = l-1 to 2 ${\eta }_k=N_k\frac{{\eta }_{k+1}\cos {\beta }_k+j{N}_k\sin {\beta }_k}{N_k\cos {\beta }_k+j{\eta }_{k+1}\sin {\beta }_k}.$
Step 3:	Compute $\rho =\left(N_1-{\eta }_2\right)/\left(N_1+{\eta }_2\right).$
Output:	$\rho$