Second, solve electromagnetic wave propagation of two-dimension concave objects by symplectic Geometrical Theory, and get better field solutions in caustic field2)comparing with classical GO method.
二利用辛几何理论求解电磁波在二维凹面体散射中的传播问题，与经典的GO解比较，特别在焦散区得到较理想的场解。
Field2: For the second entry field.
field 2：适用于第二个输入字段。
Consider the case of Field2 in more detail.
详细考虑一下Field2的情况。
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