Multilayer films including thermoplastic silicone block copolymers

A film comprising:

• a first layer comprising a first polymeric material having a first index of refraction;
• and
• a second layer contiguous to said first layer, the second layer comprising a second polymeric material having a second index of refraction less than the first index of refraction, the second polymeric material comprising at least 2 repeat units of Formula I:
• wherein each R1 is independently an alkyl, haloalkyl, aralkyl, alkenyl, aryl, or aryl substituted with an alkyl, alkoxy, or halo;
• each Y is independently an alkylene, aralkylene, or a combination thereof;
• G is a divalent residue equal to a diamine of formula R3HN-G-NHR3 minus the two —NHR3 groups;
• R3 is hydrogen, alkyl, or taken together with G and to the nitrogen to which they are both attached form a heterocyclic group;
• n is independently an integer of 0 to 1500;
• each B is independently a covalent bond, an alkylene of 4-20 carbons, an aralkylene, an arylene, or a combination thereof;
• and
• p is an integer of 1 to 10.