  We construct a 2-colored operad G^+ which, on the one hand, extends the
operad G governing homotopy Gerstenhaber algebras and, on the other hand,
extends the 2-colored operad governing open-closed homotopy algebras (OCHA). We
show that Tamarkin's G-structure on the Hochschild cochain complex C(A) of an
A-infinity algebra A extends naturally to a G^+ structure on the pair (C(A),
A). We show that a formality quasi-isomorphism for the Hochschild cochains of
the polynomial algebra can be obtained via transfer of this G^+ structure to
the cohomology of the pair (C(A), A). We show that G^+ is a sub DG operad of
the first sheet E^1(SC) of the homology spectral sequence for the
Fulton-MacPherson version SC of Voronov's Swiss Cheese operad. Finally, we
prove that the DG operads G^+ and E^1(SC) are non-formal.
