4.2.4.1 Uniaxial Materials

This is the simplest approach for two-dimensional simulation. The only important quantity necessary to obtain the polarization is the strength of the electric field in the direction $vec{X}$ of the anisotropy axis:

$$P=f(\vec{E} \cdot \vec{X}).$$ (4.16)

Thus the polarization vector reads as

$$\vec{P}=f(\vec{E} \cdot \vec{X}) \cdot\vec{X}.$$ (4.17)