Final answer:
The most common elevation used in men's haircutting is 90 degrees, which helps achieve a layered effect and even weight distribution in various styles.
Step-by-step explanation:
In men's haircutting, the elevation most commonly used is 90 degrees.
Elevations in haircutting refer to the angle at which the hair is lifted away from the scalp. Working at a 90-degree elevation helps to achieve a layering effect that contributes to a more even weight distribution and can accommodate a variety of styles.