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Once you have the Required $SN$, determine layer thicknesses ($D_1, D_2, D_3$) based on: $$SN = a_1 D_1 + a_2 D_2 m_2 + a_3 D_3 m_3$$
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Once you have the Required $SN$, determine layer thicknesses ($D_1, D_2, D_3$) based on: $$SN = a_1 D_1 + a_2 D_2 m_2 + a_3 D_3 m_3$$