The ADC is 16 bits, this means the resolution is 0.03.
That's from the datasheet page 1:
15-Bit ADC Resolution
But anyway, with the calculation you have in your sketch, the resolution is 0.06. If you use another sketch, why didn't you post it? Is the calculation in my previous post wrong? If that is correct the resolution is 0.06° because the source value is an integer and you divide by 16 you cannot get a resolution finer than 0.06.
The lowest bit of the two result bytes is the fault bit, that doesn't add to the resolution.