Model of four-point method for measuring resistance of the anti-static coatings

In the paper, mathematical models for determination of resistivity of thin antistatic coatings are presented. The models are combination of the classic four-point method and the method of images. Models 2D and 3D are taken into considerations. In both cases are analyzed the parameters of measuring system and coating layer for example: the relations between the sample size and the distance between the electrode set and the edge of the sample; thickness of the coating; type of the substrate layer. Optimization of the parameters of the system has to allow using much simpler formulas for infinite flat object.