The solution for off-diagonal 𝜎 𝑖𝑗 𝛾 values can be expressed simply as the coupling of the diagonal value of 𝜎 𝑖𝑖 𝛾 and 𝜎 𝑗𝑗 𝛾 , as shown in eq.( ). Therefore, only diagonal values need to be solved and the off-diagonal can be determined by the combining rule,