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We used Brewster’sLaw to examine the mechanism of liquid crystal(LC) alignment on anorganic insulation layer when subjected to ion-beam irradiation. Brewster’s Law implies that the maximum rate polarized ray on a slanted insulation layers on the substrate and it illustrates the dependence of polarization and the mechanical structure on the ionbeam irradiation process. The pretilt angle of nematic LCs on the organic insulation surface was about 1.13° for an ionbeam exposure of 45° for 1minute at 1800eV. This shows the dependence of LC alignment on the polarization ratio in a slanted organic insulation layer.