Figure 1
From: Ferroelectric BaTiO3/SrTiO3 multilayered thin films for room-temperature tunable microwave elements

The sketch of the formula of BTO/STO superlattice structure.
From: Ferroelectric BaTiO3/SrTiO3 multilayered thin films for room-temperature tunable microwave elements
The sketch of the formula of BTO/STO superlattice structure.