v 5.3

E_{1} = E_{10} \exp [i (ω t - k_{1} r + δ_{1})] = E_{10} \exp (i φ_{1}) \exp (i ω t) E_{2} = E_{20} \exp [i (ω t - k_{2} r + δ_{2})] = E_{20} \exp (i φ_{2}) \exp (i ω t)

${E_1=E_{10} \exp[i(\omega t - {\bf k}_1 {\bf r} + \delta_1 )] = E_{10} \exp(i\varphi_1 ) \exp(i\omega t)\\ E_2=E_{20} \exp[i(\omega t - {\bf k}_2{\bf r} + \delta_2 )] = E_{20} \exp(i\varphi_2 ) \exp(i\omega t)}$

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