SELECT "Div." FROM table_42064 WHERE "Div. Finish" = '2nd' AND "Head coach" = 'jim o''brien'
What was the division when Jim O'Brien was the head coach and the team finished 2nd in the division?
CREATE TABLE table_42064 (
    "Season" text,
    "Conf." text,
    "Conf. finish" text,
    "Div." text,
    "Div. Finish" text,
    "Head coach" text
)