Turn this cable specification into AWG
From your comment:


  How do you calculate 28*0.10mm into 38?


You don't. A single 0.10mm strand is AWG38.

The formula is based on AWG36 wire being exactly 0.005" (5 mils) in diameter. All other values are based on an exponential curve:

$$diam = 5\text{ mils} \cdot 92^{\frac{36 - AWG}{39}}$$

Solving for AWG as a function of diameter gives:

$$AWG = 36 - 39\cdot log_{92} \frac{diam}{5\text{ mils}}$$

28 strands of AWG38 has the same cross-sectional area as AWG24.