Which hair cutting technique allows for a close cut to the scalp, creating a flat top or square shape?

The technique that allows for a close cut to the scalp, creating a flat top or square shape, is clipper over comb. This method is particularly effective for achieving precise and clean lines, especially in short hairstyles. The clippers, when used over the comb, effectively cut the hair at the desired length while simultaneously allowing the stylist to control the shape of the cut. The comb acts as a guide, lifting the hair to the right angle for cutting, which is essential for creating the flat or square look commonly associated with this style.

In contrast, other techniques do not provide the same level of control or closeness to the scalp. For instance, a comb over scissor technique typically involves using scissors to cut the hair that has been combed over, which does not offer the same flat result. Notching shear over comb utilizes specialized shears to create texture or layering, rather than a uniform flat shape. Clipper under comb would involve positioning the comb beneath the haircut, which does not usually yield a close cut appropriate for flat top styles. Therefore, clipper over comb is the precise choice for achieving the desired flat top or square shape.