## Appendix A Formulas  
Here, we give the formulas of the functions employed in Equations (41) and (42).  
\[\alpha_{1}=\exp[-j(k_{1}t_{1}+k_{2}t_{2})]\left[\exp(j2k_{1}t_{1})+\exp(j2k_ {2}t_{2})\right]\] \[\left[\frac{\omega}{k_{1}}\left(\frac{\varepsilon_{1}\mu_{1}k_{ 2}}{k_{1}^{2}}-\frac{\varepsilon_{2}\mu_{2}}{k_{2}}\right)\right]\left(-\frac {k_{1}}{k_{2}}+\frac{\mu_{1}}{\mu_{2}}\right), \tag{10}\]  
\[\alpha_{2}=\exp[-j(k_{1}t_{1}+k_{2}t_{2})]\left\{1+\exp[j2(k_{1}t _{1}+k_{2}t_{2})]\right\}\] \[\left[\frac{\omega}{k_{1}}\left(-\frac{\varepsilon_{1}\mu_{1}k_{ 2}}{k_{1}^{2}}+\frac{\varepsilon_{2}\mu_{2}}{k_{2}}\right)\right]\left(\frac {k_{1}}{k_{2}}+\frac{\mu_{1}}{\mu_{2}}\right), \tag{11}\]  
\[\alpha_{3}=\exp[-j(k_{1}t_{1}+k_{2}t_{2})]\left[\exp(j2k_{1}t_{1})+\exp(j2k_ {2}t_{2})\right]\] \[\left[\frac{\omega}{k_{2}}\left(-\frac{\varepsilon_{1}\mu_{1}}{k _{1}}+\frac{\varepsilon_{2}\mu_{2}k_{1}}{k_{2}^{2}}\right)\right]\left(-\frac {k_{2}}{k_{1}}+\frac{\mu_{2}}{\mu_{1}}\right), \tag{12}\]  
\[\alpha_{4}=-j\exp[-j(k_{1}t_{1}+k_{2}t_{2})]\left[\exp(j2k_{1}t_{1})-\exp(j2 k_{2}t_{2})\right]\] \[\left[\omega\left(-\frac{\varepsilon_{1}\mu_{1}t_{1}}{k_{1}}+ \frac{\varepsilon_{2}\mu_{2}t_{2}}{k_{2}}\right)\right]\left(-\frac{k_{1}}{k _{2}}+\frac{\mu_{1}}{\mu_{2}}\right)\left(\frac{k_{2}}{k_{1}}+\frac{\mu_{2}}{ \mu_{1}}\right), \tag{13}\]\[\alpha_{5}=\exp[-j(k_{1}t_{1}+k_{2}t_{2})]\{1+\exp[j2(k_{1}t_{1}+k_{2}t_{2})]\}\] \[\left[\frac{\omega}{k_{2}}\left(\frac{\varepsilon_{1}\mu_{1}}{k_{1 }}-\frac{\varepsilon_{2}\mu_{2}k_{1}}{k_{2}^{2}}\right)\right]\left(\frac{k_{2} }{k_{1}}+\frac{\mu_{2}}{\mu_{1}}\right), \tag{100}\]  
\[\alpha_{6}=-j\exp[-j(k_{1}t_{1}+k_{2}t_{2})]\{-1+\exp[j2(k_{1}t_{1 }+k_{2}t_{2})]\}\] \[\left[\omega\left(-\frac{\varepsilon_{1}\mu_{1}t_{1}}{k_{1}}- \frac{\varepsilon_{2}\mu_{2}t_{2}}{k_{2}}\right)\right]\left(\frac{k_{1}}{k_{2 }}+\frac{\mu_{1}}{\mu_{2}}\right)\left(\frac{k_{2}}{k_{1}}+\frac{\mu_{2}}{\mu _{1}}\right), \tag{101}\]  
\[\beta_{1}=\exp[-j(k_{1}t_{1}+k_{2}t_{2})]\left[\exp(j2k_{1}t_{1} )+\exp(j2k_{2}t_{2})\right]\] \[\left[\frac{\omega}{k_{1}}\left(\frac{\varepsilon_{1}\mu_{1}k_{2} }{k_{1}^{2}}-\frac{\varepsilon_{2}\mu_{2}}{k_{2}}\right)\right]\left(-\frac{k _{1}}{k_{2}}+\frac{\varepsilon_{1}}{\varepsilon_{2}}\right), \tag{102}\]  
\[\beta_{2}=\exp[-j(k_{1}t_{1}+k_{2}t_{2})]\left\{1+\exp[j2(k_{1}t_{1 }+k_{2}t_{2})]\right\}\] \[\left[\frac{\omega}{k_{1}}\left(-\frac{\varepsilon_{1}\mu_{1}k_{2 }}{k_{1}^{2}}+\frac{\varepsilon_{2}\mu_{2}}{k_{2}}\right)\right]\left(\frac{k _{1}}{k_{2}}+\frac{\varepsilon_{1}}{\varepsilon_{2}}\right), \tag{103}\]  
\[\beta_{3}=\exp[-j(k_{1}t_{1}+k_{2}t_{2})]\left[\exp(j2k_{1}t_{1 })+\exp(j2k_{2}t_{2})\right]\] \[\left[\frac{\omega}{k_{2}}\left(-\frac{\varepsilon_{1}\mu_{1}}{k_ {1}}+\frac{\varepsilon_{2}\mu_{2}k_{1}}{k_{2}^{2}}\right)\right]\left(-\frac{k _{1}}{k_{2}}+\frac{\varepsilon_{1}}{\varepsilon_{2}}\right)\left(\frac{k_{2}}{ k_{1}}+\frac{\varepsilon_{2}}{\varepsilon_{1}}\right), \tag{104}\]  
\[\beta_{4}=-j\exp[-j(k_{1}t_{1}+k_{2}t_{2})]\left[\exp(j2k_{1}t_{1 })-\exp(j2k_{2}t_{2})\right]\] \[\left[\omega\left(-\frac{\varepsilon_{1}\mu_{1}t_{1}}{k_{1}}+ \frac{\varepsilon_{2}\mu_{2}t_{2}}{k_{2}}\right)\right]\left(-\frac{k_{1}}{k_{ 2}}+\frac{\varepsilon_{1}}{\varepsilon_{2}}\right)\left(\frac{k_{2}}{k_{1}}+ \frac{\varepsilon_{2}}{\varepsilon_{1}}\right), \tag{105}\]  
\[\beta_{5}=\exp[-j(k_{1}t_{1}+k_{2}t_{2})]\{1+\exp[j2(k_{1}t_{1}+k _{2}t_{2})]\}\] \[\left[\frac{\omega}{k_{2}}\left(\frac{\varepsilon_{1}\mu_{1}}{k_ {1}}-\frac{\varepsilon_{2}\mu_{2}k_{1}}{k_{2}^{2}}\right)\right]\left(\frac{k _{2}}{k_{1}}+\frac{\varepsilon_{2}}{\varepsilon_{1}}\right), \tag{106}\]  
and  
\[\beta_{6}=-j\exp[-j(k_{1}t_{1}+k_{2}t_{2})]\{-1+\exp[j2(k_{1}t_{1 }+k_{2}t_{2})]\}\] \[\left[\omega\left(-\frac{\varepsilon_{1}\mu_{1}t_{1}}{k_{1}}- \frac{\varepsilon_{2}\mu_{2}t_{2}}{k_{2}}\right)\right]\left(\frac{k_{1}}{k_{ 2}}+\frac{\varepsilon_{1}}{\varepsilon_{2}}\right)\left(\frac{k_{2}}{k_{1}}+ \frac{\varepsilon_{2}}{\varepsilon_{1}}\right). \tag{107}\]