$\varphi= 0.25$, where the longer segments congregate near the walls [@aakkmn]. The main difference is, the longer segment chain at the periphery of confining sphere is more mobile than the longer segment chains at periphery of cuboid or slit geometries. Indeed, we examine this by calculating the segment orientation correlation function, $C\left(t \right)=\langle{\bf u}_{i}(t_{0}) \cdot{\bf u}_{i}(t_{0}+t)\rangle_{i,t_{0}}$, for longer segments in strong confinement regime. The result indicates the longer segments at periphery of the sphere are in a constant reorientation and relocation, but in other geometries they tend to maintain their orientation, Fig. \[fig:corr\_msd\](a).

![(color online) (a) The segment orientation correlation and (b) the radial, (c) polar, and (d) azimuthal mean square displacements; all calculated under strong confinement regime. (a) represents the segment orientation correlation for longer segment chain in spherical, cuboid, and slit geometries where it shows that the segments of the chain at periphery of spherical geometry are in constant reorientation compared to other geometries. (b-d) show the MSDs for all the chains in strong spherical confinement. The angular MSDs, polar and azimuthal, show relatively higher angular mobility ($\sim 30-40\%$) for longer segment chain at periphery.[]{data-label="fig:corr_msd"}](fig4.pdf){width=".48\textwidth"}

In the strong confinement regime, we calculate the mean square displacement (MSD) of 