Comments on the following please:
"Dear x
I am writing to formally notify you that I am resigning from my position of (job title) with (name of company).
My last day of employment will be (date in 6 months' time) in line with the terms of my employment contract.
I would like to thank you for your support during my time in this role and wish both you and the company success in the future.
Yours sincerely
Jean Seberg"