h112band inTm159and the second yrast crossing inEr158andYb160

All the members of the $h_{\frac{11}{2}}$ rotational structure have been observed in ${}_{69}{}^{159}{}_{}{}^{}\mathrm{Tm}$ up to spin ${\frac{49}{2}}^{+}$. The alignments of these bands relative to the core nuclei ${}_{68}{}^{158}{}_{}{}^{}\mathrm{Er}_{90}^{}{}_{}{}^{}$ and ${}_{70}{}^{160}{}_{}{}^{}\mathrm{Yb}_{90}^{}{}_{}{}^{}$ are presented. These data provide additional evidence that the second backbend of the yrast structure of the core results from an ${\left(h_{\frac{11}{2}}\right)}^2$ proton alignment.