\after syntax?

[Matthew Pierce]

Hello all,

For hairpin positioning within a whole note, the Manual gives the syntax

\relative {
    \after 2 \< c'1
}

Is there an effective \after syntax for hairpin positioning within NON-whole 
notes, such as  the second note in this (intuitive but) nonviable expression?

  \relative {
    \after 2 \< c'4 2.
  }

CONTEXT: I need to place an \espressivo-shaped, double-hairpin swell underneath 
a dotted half note. Also, I need it to be stretchable, so that I can 
horizontally align it with the other, more active parts/staffs in my orchestral 
score.

Thanks, Matt