\bookmarksetupnext{level=part}
\appendices
\addtocontents{toc}{\protect\setcounter{tocdepth}{2}}
\makeatletter
\addtocontents{toc}{%
   \begingroup
   \let\protect\l@chapter\protect\l@section
   \let\protect\l@section\protect\l@subsection
}
\makeatother
    \input{appendices/verbs}
    \input{appendices/tuned}
    \input{appendices/nodetype_interface}
    \input{appendices/villas_structs}
    \input{appendices/infiniband_configuration}
    \input{appendices/results_benchmarks}
\bookmarksetupnext{startatroot}
\addtocontents{toc}{\endgroup}
\endappendices
\backmatter