## Appendix A  
The expression of each element in Equation (25) is as follows  
\[\begin{split}\varepsilon_{1}&=-\int_{0}^{2\pi} \mathrm{i}^{n}J_{n}(k|h(\zeta)|)\mathrm{e}^{-\mathrm{i}n\sigma}\left\{\frac{h( \zeta)}{|h(\zeta)|}\right\}^{n}  
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