I'm trying to create a TikZ flowchart where I need to differentiate between serial and parallel streams. Here's an example with serial to parallel:

serial to parallel nodes

I've managed to create a multiple stack of rectangles, but struggle to centre text and it can't be incorporated as a node shape. I could always manually draw it all, but I'm wondering whether there's an easier way to accomplish this? Particularly, is there a way to create a TikZ style with multiples overlaid rectangles that could easily be incorporated into nodes?

Here's my code, which recreates the bottom rectangle, with poorly centred text:

\draw[fill=white, minimum height=4em] #1 rectangle #2;
\draw[fill=white, minimum height=4em] #1 ++(-0.05,0.05) ++(-0.05,0.05) rectangle +#2;
\draw[fill=white, minimum height=4em, thick] #1 ++(-0.1,0.1) ++(-0.1,0.1) rectangle +#2;
\path #1 -- +#2 node[pos=0.75] {#3};
\begin{tikzpicture}[node distance = 2cm, auto]%[scale=.8, z={(-.707,-.3)}]
    \pstack{(0,0)}{(2,1)}{some text};
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You can use double copy shadow from shadows tikz library.

An example:

\tikzset{multiple/.style = {double copy shadow={shadow xshift=1ex,shadow
         yshift=-1.5ex,draw=black!30},fill=white,draw=black,thick,minimum height = 1cm,minimum
         ordinary/.style = {rectangle,draw,thick,minimum height = 1cm,minimum width=2cm}}

   \node [ordinary] at (0,0) (a) {Some};
   \node [multiple,below=3cm of a] (b) {Text};
   \draw[-latex] (a) -- coordinate (ab) (b);
   \draw (ab) -- ++(0.7,-0.5)coordinate[pos=.3](ab1) coordinate[pos=.6](ab2);
   \draw[-latex] (ab1) -- ($(b.north west)!(ab1)!(b.north east)$);
   \draw[-latex] (ab2) -- ($(b.north west)!(ab2)!(b.north east)$);

enter image description here

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