$item = Get-Item -Path "master" -ID "{110D559F-DEA5-42EA-9C1C-8A5DF7E70EF9}"
# Accepts Hashtable, Ordered Dictionaries, etc.
$parameters = [ordered]@{"SampleKey2"="SampleValue2"}
Get-Rendering -Item $item -FinalLayout |
Set-RenderingParameter -Parameter $parameters |
Set-Rendering -Item $item -FinalLayout