What does "tomorrow morning" mean in English for Spanish?

In English for Spanish, "tomorrow morning" means:

mañana por la mañana

Listen to "tomorrow morning": (If you have an HTML5 enabled browser, you can listen to the native audio below)

This is a phrase that is used in the GamesForLanguage English for Spanish Language Game in the following scenes:

• English for Spanish 4, Level 3, Scene 2