/usr/share/mate-panel/layouts/mutiny.layout is in ubuntu-mate-default-settings 18.04.17.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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orientation=top
expand=true
size=28
[Toplevel left]
orientation=left
expand=true
size=66
[Object windowbuttonsapplet]
position=0
toplevel-id=top
applet-iid=WindowButtonsAppletFactory::WindowButtonsApplet
object-type=applet
panel-right-stick=false
locked=true
[Object appmenuapplet]
position=64
toplevel-id=top
applet-iid=AppmenuAppletFactory::AppmenuApplet
object-type=applet
panel-right-stick=false
locked=true
[Object notification-area]
object-type=applet
applet-iid=NotificationAreaAppletFactory::NotificationArea
toplevel-id=top
position=20
panel-right-stick=true
locked=true
[Object indicatorappletcomplete]
object-type=applet
applet-iid=IndicatorAppletCompleteFactory::IndicatorAppletComplete
toplevel-id=top
position=10
panel-right-stick=true
locked=true
[Object clock]
object-type=applet
applet-iid=ClockAppletFactory::ClockApplet
toplevel-id=top
position=0
panel-right-stick=true
locked=true
[Object brisk-menu]
locked=true
position=0
panel-right-stick=false
toplevel-id=left
applet-iid=BriskMenuFactory::BriskMenu
object-type=applet
[Object dockapplet]
locked=true
position=10
panel-right-stick=false
toplevel-id=left
applet-iid=DockAppletFactory::DockApplet
object-type=applet
[Object trashapplet]
locked=true
position=0
panel-right-stick=true
toplevel-id=left
applet-iid=TrashAppletFactory::TrashApplet
object-type=applet
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