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Theory Manual Version 3.6
 Subsection 5.10.2: Constant Orthotropic Diffusivity Up Section 5.10: Solute Diffusivity Subsection 5.10.4: Referentially Orthotropic Diffusivity 

5.10.3 Referentially Isotropic Diffusivity

This material uses a strain-dependent diffusivity tensor that is isotropic in the reference configuration and accommodates strain-induced anisotropy: where is the jacobian of the deformation, i.e. where is the deformation gradient, and is the left Cauchy-Green tensor. Note that the diffusivity in the reference state ( ) is isotropic and given by .
 Subsection 5.10.2: Constant Orthotropic Diffusivity Up Section 5.10: Solute Diffusivity Subsection 5.10.4: Referentially Orthotropic Diffusivity