2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/192079A higher--twist nuclear enhancement of $R = σ_L/σ_T$, as might be expected to arise due to fermi motion and whose magnitude is within the error-bars of recent experiment, is shown to lead to a monotonic {\it decrease} in the ratio of nuclear vs. nucleon cross--sections at small Bjorken $x$ for {\it increasing} $Q^2$. This effect at small $x$, comparable in magnitude to those reported for shadowing, is driven mainly by kinematic factors and essentially vanishes for $x > .1$. Its unusual $Q^2$ dependence rather complicates the unravelling from present data in the shadowing region the corresponding dependence in $Q^2$ of the nuclear structure functions, $F_2^{A}(x,Q^2)$.10 pages + 2 Figures, DOE/ER/40762--019, UMPP \#94--039High Energy Physics - Phenomenologytext