Swap out some of the atoms from the core with the atoms from the shell:

• Copy the "pdpt/" directory into the "lab2/" directory and re-name the directory to "ptpd".
• Using nano, edit your POSCAR to swap out some of the atoms from the core with the atoms from the shell. Remember, the first 6 atom positions are Pd and the last 32 are Pt. By simply moving some of the first 32 lines to the end of the list of atoms, you will have swapped some core and shell atoms.
• Use xyz to verify that some of the core atoms have been swapped with the shell atoms.
• Remember to change the job name in the submit file.
• Run this job and calculate the new cohesive energy.