Hello Dips

A termination letter, if you are issuing after a proper disciplinary action then it would require to be legally drafted. So better consult an expert if the employee is covered under labour laws.If the termination letter mentions any misbehaviour/misconduct then a proper enquiry is to be held. However for managerial staff the best option is to terminate services as per the offer of appointment by issuing a discharge simpliciter, which can read as follows:
Shri ----
Design:
In terms of clause no. of the offer of appointment dated issued to you and accepted by you on , you are hereby discharged from the services of this organisation. We enclose a cheque (No. dated ) for an amount of Rs. towards notice period.
We thank you for the services rendered to the company.
Thanking you.
I hope the above would meet your requirement

Regards Nair KK