What is the ideal Rembrandt lighting photography setup for capturing dramatic and well-defined shadows on the subject's face?

The ideal Rembrandt lighting setup for capturing dramatic and well-defined shadows on the subject's face involves positioning a single light source at a 45-degree angle to the side of the subject, slightly above eye level. This creates a triangle of light on the cheek opposite the light source, with a small triangle of shadow under the eye on the same side. This setup helps to create a sense of depth and drama in the photograph.