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Theory Manual Version 3.6
 Subsection 5.9.4: Referentially Isotropic Permeability Up Section 5.9: Hydraulic Permeability Subsection 5.9.6: Referentially Transversely Isotropic Permeability 

5.9.5 Referentially Orthotropic Permeability

This material uses a strain-dependent permeability tensor that is orthotropic in the reference configuration, and accommodates strain-induced anisotropy [8]: where, Here, are second order tensors representing the spatial structural tensors describing the orthogonal planes of symmetry, given by where are orthonormal vectors normal to the planes of symmetry. Note that the permeability in the reference state ( ) is given by .
 Subsection 5.9.4: Referentially Isotropic Permeability Up Section 5.9: Hydraulic Permeability Subsection 5.9.6: Referentially Transversely Isotropic Permeability