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A particular challenge for low temperature plasma (LTP) research is the diversity of parameter space and conditions. For plasma systems where the densities are not low, the kinetic theory is time-consuming and becomes unrealistic. In this regime, the particle-in-Cell (PIC) method is appropriate where the evolution of a particle system at every time step consists of an Eulerian stage and a Lagrangian stage. The PIC method can deal with complex geometries and large distortions in the field. The PIC solver, Starfish, is a two-dimensional plasma and gas simulation code operating on structured 2D/axisymmetric Cartesian or body fitted stretched meshes. The purpose of this study is to use the Starfish Plasma Simulation Code for numerical simulations of plasma interfaces. Specifically, two applications are considered: 1) the modeling of a large area (30 cm x 30 cm) microwave plasma chemical vapor deposition system, and 2) the understanding of LTP treatment on surface modification of polycaprolactone pellets and thermal properties of extruded filaments. With the exact geometries and experimental results being provided, numerical simulations of these two applications are ongoing.