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4 layers should be enough for .2 layers. You should check if you're not under-extruding, this could cause the top layer to have gaps. If the filament you're using has a diameter that is considerably smaller than 1.75mm (or whatever the nominal diameter should be), too little material will be extruded unless you determine the actual diameter with an accurate caliper or micrometer, and configure this diameter in your slicer. Also if the filament is rather soft, you may need to increase the extrusion multiplier.