It’s up to you. Some companies don’t provide any written information
to employees upon their termination for fear that the documentation
may be used against the organization. They simply provide employees with final checks and COBRA paperwork. Other companies provide a very basic written statement declaring, ‘‘Today will be your last day of employment with the company.’’ No cause of termination is mentioned.

Still other companies provide very detailed information in a written letter explaining all the reasons why termination is occurring. Remember, a well-constructed termination letter could go a long way toward fending off potential litigation claims because contingency plaintiff attorneys are less likely to take a case that appears to be airtight in favor of the employer. On the other hand, a termination letter with inaccurate information could be the very documentation a plaintiff attorney needs to prove that the company was less than responsible in the fact-finding that led up to the decision to terminate.

Tell Me More
If you’re going to write a specific letter of termination, include the following information in the body of the letter:
Written warnings
Performance reviews that showthe employee was not meeting expectations
Merit reviews that show the employee received no increase in pay
Any decision-making leaves or suspensions that the employee
received prior to termination
Any other affirmative efforts you made in an attempt to rehabilitate
the employee

Taken From : The Hiring and Firing Quention and Answer Book