Bi1.5Zn1.0Nb1.5O7/Mn-doped　Ba0.6Sr0.4TiO3　heterolayered　thin　films　were　deliberately　deposited　on　Pt/Ti/SiO2/Si　substrate　by　pulsed　laser　deposition　and　used　as　tunable　materials.　The　heterolayered　films　exhibit　prominently　enhanced　tunable　performance　compared　to　previous　reported　dielectric/ferroelectric　layered　composite　films,　i.e.,　a　repeatable　large　tunability　of　55%-60%　measured　under　dc　bias　field　of　570　kV/cm,　with　temperature　insensitive　permittivity　near　room　temperature,　while　the　dielectric　losses　can　be　safely　maintained　below　0.5%.　The　results　indicate　that　Bi1.5Zn1.0Nb1.5O7/Mn-doped　Ba0.6Sr0.4TiO3　heterolayered　thin　films　are　excellent　candidates　for　electrically　steerable　applications.　(C)　2008　American　Institute　of　Physics.