A mechitzah for one woman?

Hi, Where a group of men are davening and one or two women are present, and this is not an on-going occurrence, no mechitzah is required. [This assumes that the men will not see anything they are not permitted to see while davening. - MT] (Rav Moshe Feinstein, Igrot Moshe Orach Chaim 5:12:2) Have a great day, Mordechai