I would say, do not turn ALL the way. Turn your shoulder/side (preferably non-dominant) to the dog, keeping it in your peripheral vision. This will work fairly well even on dogs without much obedience training, provided they are mostly looking to greet you and not to attack you, because they ARE, as a species, pretty good at reading human body language.

If the dog is looking to attack you -- well, that's why you want to keep it in your peripheral vision, so that you know what it is doing.