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Double Layer Reflection

R=| r 2 |= r 1 2 + r 2 2 + r 3 2 + r 1 2 r 2 2 r 3 2 +2 r 1 r 2 ( 1+ r 3 2 )cos2 θ 1 +2 r 2 r 3 ( 1+ r 1 2 )cos2 θ 2 +2 r 1 r 3 cos2( θ 1 + θ 2 )+2 r 1 r 2 2 r 3 cos2( θ 1 θ 2 ) 1+ r 1 2 r 2 2 + r 1 2 r 3 2 + r 2 2 r 3 2 +2 r 1 r 2 ( 1+ r 3 2 )cos2 θ 1 +2 r 2 r 3 ( 1+ r 1 2 )cos2θ+2 r 1 r 3 cos2( θ 1 + θ 2 )+2 r 1 r 2 2 r 3 cos2( θ 1 θ 2 )