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The x axis acts as a boundary line of two media with z equals 0. The incident ray travels below the negative z axis from the medium 1 (epsilon sub 1, micro sub 1) to the origin with incident angle theta sub I and reflects back to the medium 1 above the negative z axis with reflected angle theta sub r. The wave partially transmitted in the medium 2 above the z axis with an angle theta sub t.

The parallel components of incident ray are E sup I and H sup I. The parallel components of reflected ray are E sup r and H sup r. The parallel components of transmitted ray are E sup t and H sup t.

Unit vectors of incident, reflected and transmitted rays are K sub I caret, K sub r caret, and K sub t caret.