First, install setxkbmap:
$ kiss b setxkbmap
$ kiss i setxkbmap
Available layouts can be found in /usr/share/X11/xkb/symbols/ and set from the command line:
$ setxkbmap latam
Put the above command in ~/.xinitrc to load it whenever an X session is started.
Create 00-keyboard.conf in /etc/X11/xorg.conf.d/ and edit the Xkb* options below to suit your needs. 0
Section "InputClass"
Identifier "system-keyboard"
MatchIsKeyboard "on"
Option "XkbLayout" "de"
Option "XkbModel" "pc105"
Option "XkbVariant" ",qwertz"
Option "XkbOptions" "grp:alt_shift_toggle"
EndSection