[Anglika]

There is no specific way.

You could say:

Dear [name of manager],

Please note that I am hereby giving you two weeks' notice as from [date] that I shall be leaving the company/resigning from the company. My last working day will be [date].

Thank you.

Yours sincerely,

name


[If you have any outstanding annual leave, you should indicate that this time is still owing to you]