a method for producing an opaque polymeric film comprises : extruding a base layer comprising a polymeric matrix and at least one cavitating agent ; coextruding at least one additional layer on at least one side of the base layer ; cooling the coextruded multi - layer film ; and then orienting the film in at least the machine direction ; wherein at least said base layer contains a syndiotactic polystyrene polymer , and wherein said syndiotactic polystyrene polymer is in the form of solid , non - hollow particles during the orienting step .