A SMAS facelift typically lifts and tightens the connective tissue layer enveloping the muscles of facial expression; this tissue layer is called the superficial musculoaponeurotic layer, or SMAS. There are many variations of SMAS facelifting surgery, with folds or flaps created in the SMAS layer. A deep plane facelift is a broad term for surgery that involves working in the layers deep to the SMAS. A surgeon's technique depends on training, personal experience, and continued education. Terminology in facial rejuvenation surgery can vary widely between practitioners; furthermore, there's no consensus regarding which technique is best or longest-lasting. Given this, a surgeon's skill, follow-up care, and patient rapport is likely more important than a particular technique. Choose a surgeon with a keen understanding of facial anatomy and thorough experience; review before and after photos; and undergo an in-person consult and exam to discuss your expected outcome. Good luck!