does an employer who has employed a person for 13 years have to give written notice of the reasons for termination of employment? this is a follow up from my last question

If the employer is not terminating for cause, there is no need to give a reason. The employer is required to provide reasonable notice of termination or pay in lieu of notice (severance). To see how much notice or pay is owed, use the calculator and then give me a call: www.severancepaycalculator.com .
Lior Samfiru