Be determined! State exactly what you mean in your termination letter. Don’t mince your words and speak directly. Do not waste the time of a person who is being discharged by writing big references for him before you get down to business. He is not hired any more, so pay attention for the first paragraph of the termination to concern this point.
Make up a list of your grounds. After you have undoubtedly confirmed that they are already jobless, then give as many reasons as possible regarding other motives. What a moment before handing otherwise it might just mislead them.