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How can the chiral tensor of bi – anisotropic materials be expressed?

How can the chiral tensor of bi – anisotropic materials be expressed? Correct Answer κ = (1 / 3) tr(κ)I + N + J

The chiral tensor of bi – anisotropic materials can be expressed as; κ = (1 / 3) tr(κ)I + N + J, Where tr(κ) is the trace, I is the identity matrix, N is a symmetric trace – free tensor and J is an anti – symmetric tensor. κ is the chiral tensor denoting chiral electromagnetic and reciprocal magneto – electric response.

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