  Proposals are made to describe the Weyl scaling transformation laws of
supercovariant derivatives $\nabla{}_{\underline A}$, the torsion supertensors
$T{}_{{\underline A} \, {\underline B}}{}^{{\underline C}}$, and curvature
supertensors $R{}_{{\underline A} \, {\underline B}}{}_{\, \underline c}
{}^{\underline d}$ in 10D superspaces. Starting from the proposal that an
unconstrained supergravity prepotential for the 11D, $\mathcal{N}$ = 1 theory
is described by a scalar superfield, considerations for supergravity
prepotentials in the 10D theories are enumerated. We derive infinitesimal 10D
superspace Weyl transformation laws and discover ten possible 10D,
$\mathcal{N}$ = 1 superfield supergravity prepotentials. The first
identification of all off-shell ten dimensional supergeometrical Weyl field
strength tensors, constructed from respective torsions, is presented.
