Changes
/* Conventional Physical Optics (GO-PO) */
:<math> \mathbf{M(r)} = -Z_s \mathbf{\hat{n}\times} \mathbf{J(r)} </math>
In the case of an impedance-matched surface (Zη<sub>s</sub> = η<sub>0</sub>1), one can write:
:<math> R_{\|} = -R_{\perp} = \frac{1-\cos\theta- 1} {1+\cos\theta+ 1} </math>
<table>
</table>
Two special limiting cases of an impedance surface are perfect electric conductor (PEC) and perfect magnetic conductor (PMC) surface. For a PEC surface, Z<sub>s</sub> = 0, R<sub>||</sub> = 1 and R<sub>⊥</sub> = -1, and one can write:
:<math> \mathbf{J(r)} = 2 \mathbf{\hat{n} \times H(r)} </math>
