Denzel Washington's Clipper Cut

A: In the films “John Q” and “Déjà vu” Mr. Washington seems to be sporting a standard man’s clipper cut, tapering from a length of approximately one inch at the top and crown area and decreasing as you move downward to the perimeter on the sides and at the nape of the neck. It should also be noted that his hair appears to have been treated with a mild relaxer to create a gentle waving pattern and texture in the look of the hair.
Here are the basic lengths designated for a WAHL model clipper and its attachments:
• #0 (no attachment) – 1/100 inch
• #1 – 1/8 inch
• #2 – ¼ inch
• #3 – 3/8 inch
• #4 – ½ inch
• #7 – 7/8 inch
• #8 – 1 inch

As mentioned before, different manufacturers of hair clippers have slightly varying lengths associated with their attachments. Some companies offer a smaller selection of clipper attachments that span a shorter range of lengths, while others may offer a full range of lengths in 1/8th or even 1/16th inch increments. To be certain of the specific length of your hair, you need to know the specifications of the clipper manufacturer.
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See also:
Clipper cutting techniques
Hair straightening and relaxing Q&A