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/* Conventional Physical Optics (GO-PO) */
</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, η<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>
:<math> \mathbf{M(r)} = 0 </math>
while for a PMC surface, Z<sub>s</sub> = ∞, η<sub>s</sub> = ∞, R<sub>||</sub> = -1 and R<sub>⊥</sub> = 1, and one can write:
:<math> \mathbf{J(r)} = 0 </math>
