2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/137446We study orthonormal normal sections of two-dimensional immersions in $\mathbb R^{n+2},$ $n\ge 2$, at which these sections are critical for a functional of total torsion. In particular, we establish upper bounds for the torsion coefficients in the case of non-flat normal bundles. With these notes we continue a foregoing paper on surfaces in $\mathbb R^4.$Differential GeometryAnalysis of PDEs53A07, 35J60, 49K20text