PLA Prints at 0.2 mm layer height. The base and pattern are 2 mm and 1.4 mm high respectively, so you can issue a color change command at the 2.20 mm mark to print them in different colors. To slice the models: In PrusaSlicer import the base, then add the pattern as a part. In Cura import both models, select both of them, and merge them. Use ironing on the topmost surface.