v 6.30

I_{i} (r) \propto E_{0 t}^{2} + E_{0 i}^{2} (r) + E_{0 t}^{2} E_{0 i}^{2} (r) \exp [- i δ_{i} (r)] + \exp [i δ_{i} (r)]

${I_i (r) \varpropto E_{0t}^2+ E_{0i}^2 (r)+E_{0t}^2 E_{0i}^2 (r){\exp[-i\delta_i (r)]+\exp[i\delta_i (r)]}}$

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