+ \begin{itemize}
+ \item every $d_v$ steps transfer of a fraction $d_r$
+ of carbon atoms from crystalline volumina to
+ an amorphous neighbour volume
+ \item remove $3 \, nm$ surface layer after $n$ loops,
+ shift remaining cells $3 \, nm$ up and insert
+ an empty, crystalline $3 \, nm$ bottom layer
+ \end{itemize}
+\end{minipage}%