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Isotropic (the default) — enter only one value c.
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Diagonal — enter the diagonal components for an anisotropic material with the main axes aligned with the model’s coordinate system.
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Symmetric — enter a symmetric matrix using the diagonal components and the upper off-diagonal components.
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Full — enter the full 2-by-2 (2D) or 3-by-3 (3D) matrix for an anisotropic material:
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