I want to display a teaser on the top of each article under the title,
as in following “full content” layout:

 1. Title
 2. Teaser (article summary)
 3. Image
 4. Body

Moreover the teaser should have its own formatting (for example italic and a bigger font)

I did not find any way to do that without editing tpl files or core files.

A solution would be to  add a new field "article_teaser" to my content type, then manage display in order to get my layout in “Full content” view. This works, but I do not like to have two teaser-fields in my input content form, because I should type two times the same text.

It seems that I cannot split the field body in its “text” and “summary” parts, but I can only display one or the other, but not both!

Is there any way (a module?) to do that?

(My environment: Drupal 7 with Zen sub theme.)