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Layered oxides have been intensively studied due to their high degree offreedom in designing various electromagnetic properties and functionalities.While Bi-based layered supercell (LSC) compounds[Bi$_n$O$_{n+\delta}$]-[$M$O$_2$] ($M$ = Mn, Mn/Al, Mn/Fe, or Mn/Ni; $n=2, 3$)are a group of prospective candidates, all of the reported compounds areinsulators. Here, we report on the synthesis of two novel metallic LSCcompounds [Bi$_{n}$O$_{n+\delta}$]-[RhO$_2$] ($n=2, 3$) by pulsed laserdeposition and subsequent annealing. With tuning the thickness of thesublattice from Bi$_2$O$_{2+\delta}$ to Bi$_3$O$_{3+\delta}$, adimensionality-dependent electrical transport is revealed from a conventionalmetallic transport in $n=2$ to a localized transport in $n=3$. Our successfulgrowth will be an important step for further exploring novel layered oxidecompounds.

Novel supercell compounds of layered Bi-Rh-O with $p$-type metallic conduction materialized as a thin film form