Type II is the standard variation of anodising and clear coatings typically have a thickness of 5-15 μm and coloured/dyed coatings 10-25 μm.
Type III anodising also known as 'hard anodising’ can have a thickness of 20-80 μm.
A good design guideline to follow is that 50% of the anodic coating is below the original surface and 50% is above. Therefore, a 12 μm coating would increase the part thickness by 6 μm.