do this therefore most biaxial orientation processes use apparatus which stretches the films sequentially first in one direction and then in the other preferably in the md first and then in the td a discussion of high biaxial orientation of polyethylene films is provided in u s pat no 5 885 721 the present films may for example be stretched in the md from about 5 1 to about 8 1 and in the td from about 6 1 to about 15 1 the present films may be in the form of monolayer cavitated films or multilayer films including at least one cavitated layer the present film may have more than one cavitated layer for example such a three layer film may have a cavitated surface layer a cavitated core layer and a noncavitated i e void free thermoplastic skin layer other examples of multilayer films include those with both skin layers being cavitated optionally including one or more core layers which may or may not be cavitated one or more cavitated layers may also be included within skin layers which are both not cavitated any of the layers of the present film whether cavitated or not cavitated may optionally include various additives such additives include but are not limited to anti.