Please identify this

When i was little i saw a movie, and all i remember were these predator type aliens who could skin people and wear their skin. For instance, i remember a scene were there was a policeman and he was getting out of his police car (at night) and the alien jumped him and skinned him. When the alien got up, it was the policeman, but clearly it was the alien wearing the policeman's skin and uniform. I also remember a dome where people were residing in. That's all i remember. I watched this movie about 1985/1986.

Thanks for any help.