Final answer:
In a square one length above the shoulders haircut, the hair is cut without over-direction, held out at a 90-degree angle from the head to create an even, horizontal line around the head.
Step-by-step explanation:
When cutting a square one length above the shoulders haircut, the type of over-direction typically used is none, which means that the hair is held at a 90-degree angle from the head and cut at the same elevation all the way around the head. This results in a uniform length with no layering, creating a strong horizontal line that is characteristic of a square or one-length haircut. The key to this haircut is maintaining consistent tension and cutting each section of hair at the same elevation and over-direction to ensure that the length is even all around the head.