${\mathrm{RuSr}}_{2}{\mathrm{GdCu}}_{2}{\mathrm{O}}_{8}$ films with a different thickness are grown by pulsed laser deposition on a (100) STO substrate at 750 \ifmmode^\circ\else\textdegree\fi{}C and an oxygen background pressure of $5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}\phantom{\rule{0.2em}{0ex}}\mathrm{Pa}$. The film structure is characterized by x-ray diffraction, Raman spectroscopy and transmission electron microscopy (TEM), and correlated with the physical properties. All films exhibit ferromagnetic ordering at temperatures around 130 K, however not all films show superconductivity. TEM reveals that superconductivity in the films is related to the presence of an orthorhombic Ru-1212 phase with unit cell parameters $\ensuremath{\surd}2{a}_{t}\ifmmode\times\else\texttimes\fi{}\ensuremath{\surd}2{a}_{t}\ifmmode\times\else\texttimes\fi{}2{c}_{t}$. A model considering Cu substitution at Ru positions within the ${\mathrm{RuO}}_{2}$ layer is proposed. The structure of the orthorhombic Ru-1212 with a doubled $c$ axis can be described as a periodic alteration of superconducting ${\mathrm{Ru}}_{1\ensuremath{-}x}{\mathrm{Cu}}_{x}{\mathrm{Sr}}_{2}{\mathrm{GdCu}}_{2}{\mathrm{O}}_{8\ensuremath{-}\ensuremath{\delta}}$ layers and ferromagnetic ${\mathrm{RuSr}}_{2}{\mathrm{GdCu}}_{2}{\mathrm{O}}_{8}$ layers. The structure in the thin film is strain induced, but there is a high probability that it will exist in bulk as well.