How is the car body paint coat look like?

How is the car body coat look like? Study this from sierra glow information:

Paint and Polish
How much of urethane paint of an automobile can be polished? Isn’t that polishing removes a thin layer of the clear coat and harms the paint or clear coat? These are frequently asked questions.
First, we must understand how thick the car paint is? It depends on the car model, the production year and etc. Generally speaking, the layer and the average thickness of the car paint is as below:
The primer (to protect rust) : about 10 micron
The surfacer : about 20 micron
The undercoat (or color base) : about 30 micron
The topcoat (or clear coat) : about 50 – 60 micron
The total thickness of the paint, therefore, is about 110 – 120 micron or 0.11 – 0.12 mm. Very thin, indeed. Just compare with about 100 micron of newspaper thickness. The thickness which can be generally polished (or removed) should be less than 15 – 20 micron, less than one third of the topcoat to protect the paint and keep its shine.
Next, is the actual polishing work. For your information and reference, please refer to the table below: